Wrist-pin joint



R. F.B|NGMAN WRIST PIN JOINT Nov. 5, 1929.

Filed o'ot. 2, '1928 Ynvwnvroz Ror fl .Bumm/uv.

BY Y

A TTORNE Y Patented' Nv. 5, 1929 Hurrah` STATES ROBERT F. BINGMAN, F PORTLAND, OREGON WRIST-rm JOINT Application filed October 2, 1928. Serial No.` 309,789.

This invention relates vto bearing connections between the pistons and connecting-rods of a reciprocating engine. p

The object of my invention is to provide a wrist-pin joint between the piston and connecting-rod of simple and practicable construction to compensate for any misalignment of the wrist-pins from parallel relation with the crank-shaft and Wherebyangularly directed forces upon the piston are-obviated and consequent undue and unequal wear upon the piston and cylinder-walls are avoided.

A further object of the invention is the provision of devices for the reduction of wear ,15 upon the joint between the connecting-rod and the wrist-pin to a minimum by affording angularl readjustments in one direction only.

A still further object of the invention is to provide simple and eiiicient devices in a wrist- 2o pm joint alording an improved and novel method :for taking up any slack or wear that ma occur therein. i

ther objects land advantages, and objects relating to details of construction and arran ement of parts of the invention will be rea ily apparent in the course of the full de'- scription to follow.

The accompanying drawings illustrate by way of example a representative form of my :aoI invention, in which Figure 1 is a view in vertical section of a piston and connecting-rod therefor withthe wrist-pin joint therebetween, the connecting-rod being broken away, and the line of v sectionbeing substantially upon line 1 1 yof Fig. 2. v A

Fig. 2 is a view partly in side elevation and partly in section of the upper portion of a connecting-rod with my improved wrist-pin joint illustrated thereo Fig. 3 is a detached perspective view o f a wrist-pin and ball member mounted thereon. Fig. 4.- is a detached perspective View of one of the bushing elements of my invention. Y Fig. 5 is adlagrammatic view in side eleva'- tion of an engine crank-shaft and connected pistons illustrating the purposes of the invention.

Referring to said views, the reference numeral 10 indicates a piston of ordinary construction provided with packing-rings 11 in its side walls 12 and having an interior cham ber 13. Oppositely disposed integralbosses 15 extend inwardly from the side walls ofl the j piston and which are bored diametrically, 55 as at 16, to ali'ordbearings for a 'wrist-pin 17 f whereby the connecting-rod 18 is attached to the piston while its opposite end is connected to the crank-shaft 19 inthe usualmanner.

The upper end of said connecting-rod is 6o formed with an veye consisting in screw threaded bores 20 extending inwardly from opposite sides-thereof and separated by a relatively shallow annular rib 21 at mid-disy tance from the opposite sides of the. rod. o5 Cupped `bushings 22 are exteriorly screwthreaded and adapted to be screwed into the respective bores 20 from each side and bear at their inner edges 23- upon the oppositev sides of the rib 21. The outer `faces of said v bushings are formed with recesses'25 to receive a wrench for setting or removingthem from the bores. Said bushings are, each formed with a subst-antially semi-globularsocket 26 on its inner vface and with an aper- 75 ture 27 concentric with the axis of such socket C and of the bores 20.

A metal ball 28 is formed with a diametrically disposed .bore 30 through which it is mounted upon thewrist-pin and its globular 8o exterior is adapted to effect a close working lit with the globular cavity formed by the bushing-sockets 26. The outer portions of the ball are planed perpendicular to the bore 30 in the plane of the side surfaces of the con- 35 necting-rod. l A screw-threaded hole 31 is formed in the eye of the connecting-rod extending horizontally from one side. A similarly positioned and registering hole 32 is formed in 90 the ball 28 of reduced diameter through which the reduced end 33 of a retaining-pin 35 extends whose outer, larger' and screw-f I threaded end 36 is secured in the hole 31 with'v a shoulder 37 bearing upon the ball. The ex- 95 tremity. 38 of said pin extends into a hole 40 of the wrist-pin thus securing the entire wr1st-pin joint from relative rotation or movement inthe rotary direction .of the crank-shaft while allowing complete freedom of oscillating movement of the connecting` rod about the axial-pin 35.V

The connecting-rod being connected to the wrist-pin without relative movement therebetween except f`or angular readjustments about the axis of the pin 35 the wrist-pin is designed to rock in the bores 16 and is also slidable longitudinally therein for'additional readjustment of the wrist-pin relative to the connection of the connecting-rod upon the crank-shaft through the provision of spaces A a pair of oppositely disposed the self-adjustment of theV connecting-rod upon the lwrist-pin to overcome any misalignment of the wrist-pin from parallel relation with the crank-shaft so that the pistons will reciprocate in their cylinders without deflecvversely of the wrist-pin, tending through the connecting-rod and ball 2. The combination of elements as specified in claim l, including an integral annular rib extending interiorly of the eye in the connecting-rod intermediate of the two opposing bores therein, and affording a stop for the engagement u ony its opposite sides of the inner ends of the ushings. f

3. A piston, a Wrist-pin disposed therein, a ball mounted onsaid wrist-pin, a connecting-rod having a globular socket to receive said ball, said socket being divided transand an axis-pin ex# and into thev Wrist-pin limiting the connecting-rod to oscillatorymovements in the vertical plane of the wrist-pin.

' ROBERT F. BINGMAN.

end to pinch said slotl firmly hold tion due to the cramping of the connectingrods upon the wrist-pins by a rigid connection of the connecting-rods causing a deflection thereof. v

It will be apparent from an inspection of Fig. 5 that a slight error -in alignment of the crank-shaft bearings ina vertical plane on either end will be accentuated in the upper ends of the connecting-rods until the pistons are inclined to work unevenly land cause marked Wear upon the cylinder-walls. By affording opportunity for the connectingrods to deflect in angular directions in the vertical plane of the wrist-pin and so arranging it to turn about a relatively fixed axis, such as the pin 35, I obviate this difficulty and reduce the wear upon the parts and particularly upon the ball and socket to a minimum.

Having described my invention, what I claim, isz- 1. The combination with a piston having diametrically of the piston, a wrist-pin ari ranged in said bores,la ball mounted on said wrist-pin,a connecting-rod having an eye at its upper end formed with a screw-'thread-- ed bore extending inwardly from each side,

a screw-threaded bushing engageable in said Ieye-boresfrom each of its opposite sides', said bushings co''operating to include .a globular sock t in which said ball is seated, and a pin extening horizontally through the connecting-Tod, ball and into the wrist-pin providing an axis of oscillation for the connectingrod in the vertical plane of the wrist-pin.

bosses bored 

